Bats, N.

F\ue9cant, A.

Guillon, E.

Hastoye, G.

Kirschhock, C.E.A.

Liang, Duoduo

Martens, J.A.

Van Tendeloo, Gustaaf

Vanbutsele, G.

Abstract: ZSM-48 and related zeolites are considered to be highly disordered structures. Different polytypes can be clearly distinguished by simulation of high-resolution electron microscopy images. Synthesis of phase-pure polytypes was attempted. One of the investigated samples crystallized via seeding designated as COK-8 consisted of nanoscopic, needlelike crystals with a very large length/width ratio, growing along the pore direction. These specimens are phase-pure polytype 6 (PT6, numbering according to Lobo and van Koningsveld). Aggregates of these nanoneedles occasionally contained a second polytype: PT1. The latter polytype occurred more abundantly in larger crystal rods in an IZM-1 sample crystallized in ethylene glycol. Here too, the isolated crystallites mainly consist of large, defect-free regions of PT6. A simulation of polytype lattice energies offers a rational explanation for the observed polytypical intergrowth formation

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Ordered end-member of ZSM-48 zeolite family

Ordered end-member of ZSM-48 zeolite family

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Institutional Repository Universiteit Antwerpen